IS 9573 : 2012

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Indian Standard RUBBER HOSE FOR LIQUEFIED PETROLEUM GAS (LPG) -- SPECIFICATION ( Third Revision )

ICS 83.060

© BIS 2012

BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002

November 2012

Price Group 3

Rubber and Rubber Products Sectional Committee, PCD 13

FOREWORD This Indian Standard (Third Revision) was adopted by the Bureau of Indian Standards, after the draft finalized by the Rubber and Rubber Products Sectional Committee had been approved by the Petroleum, Coal and Related Products Division Council. This standard was first published in 1980. In the first revision requirements for flexibility and electrical continuity were included. In the swelling test, n-pentane was prescribed as test liquid in place of iso-octane and requirements for tensile strength and accelerated ageing were also modified. In the second revision carried out in 1998, requirements for wire braided rubber hose for domestic/commercial installations were included besides grip strength of hose, burning behaviour and resistance to crushing requirements. Besides, modification was carried out in swelling in test liquid requirements as resistance of liquid to n-pentane; proof pressure test and bursting pressure requirement. In this revision, number of types of hoses has been reduced from four to two in order to rationalize the varieties. The manufacturers have been given freedom to choose constructional options with different lining material such as chloroprene rubber (CR) or nitrile butadiene rubber (NBR)-Polyvinyl chloride (PVC), etc. Modifications have been carried out in the requirement of dimensions; thickness of lining and cover; length; flexibility of hose and bursting pressure test. Marking clause has also been updated to mark the product at the defined lengths. The hoses covered by this standard are suitable for use in LPG vapour phase and LPG/air installations. These hoses may also be put to `wet' use, that is, permanently filled with liquid and in the temperature range from ­30°C to 60°C. In the formulation of this standard assistance has been derived from ISO 2928 : 2003 `Rubber hose and hose assemblies for liquefied petroleum gas (LPG) in the liquid or gaseous phase and natural gas up to 25 bar (2.5 MPa) -- Specification' and BS 3212 : 1991 `Specification for flexible rubber tubing, rubber hose and rubber hose assemblies for use in LPG vapour phase and LPG/air installation' and BS 4089 : 1989 `Hoses and hose assemblies for liquefied petroleum gases'. A separate standard IS 10908 : 1991 `Flexible rubber tubing for liquefied petroleum gas (first revision)' has been formulated for flexible rubber tubing for liquefied petroleum gas. This standard contains clauses 5.3.3 and 6.1 which call for agreement between the purchaser and the supplier. In reporting the result of a test or analysis made in accordance with this standard, if the final value, observed or calculated, expressing the result of test or analysis, is to be rounded off, it shall be done in accordance with IS 2 : 1960 `Rules for rounding off numerical values (revised)'.

IS 9573 : 2012

Indian Standard RUBBER HOSE FOR LIQUEFIED PETROLEUM GAS (LPG) -- SPECIFICATION ( Third Revision )
1 SCOPE This standard prescribes the requirements and methods of sampling and test for rubber hose for liquefied petroleum gases (LPG) for a maximum ambient temperature of 65°C and a maximum working pressure of 2.5 MPa for Type I, and 1.0 MPa for Type II hoses. 2 REFERENCES The following standards contain provisions which through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties to agreement based on the standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Title Methods of sampling and test for rubber hoses (second revision) 3400 (Part 24) : Methods of test for vulcanized rubber : 2009/ISO 8033 : Part 24 Rubber and plastics hose -- 2006 Determination of adhesion between components 4576 : 1999 Liquefied petroleum gases -- Specification (second revision) 7503 Glossary of terms used in rubber industry: (Part 1) : 1988 Definitions of basic terms ( first revision) (Part 2) : 1988 Definitions of additives (first revision) (Part 3) : 1988 Definition relating to properties and testing (first revision) (Part 4) : 1988 Definition relating to processing (first revision) (Part 5) : 1988 Definition relating to products -- Hoses (first revision) 3 TERMINOLOGY For the purpose of this standard, the definitions given in IS 7503 (Parts 1 to 5) and the following shall apply. 3.1 Liquefied Petroleum Gas (LPG) (see IS 4576). 4 TYPES This standard prescribes two types of hoses: 1 IS No. 443 :1975 Type I -- Hose for Industrial Applications Like LPG Bottling Plant Wire or textile reinforced hose suitable for a maximum working pressure of 2.5 MPa. The coupled hose assembly shall have the capability to conduct electrical charge from one coupling to another. If this capability in textile reinforced hose is provided by means of metallic wires, then not less than two (crossed) metallic bonding wires shall be incorporated in the hose. The metallic wire shall have resistance to corrosion, fatigue and work hardening b) Type II -- Wire Reinforced Hose for Domestic/ Commercial Installation Hose for connecting the gas cylinder(s) with burner(s) for domestic and commercial installations suitable for a maximum working pressure of 1.0 MPa. 5 REQUIREMENTS 5.1 The hose shall consist of lining, reinforcement and cover. 5.2 Material 5.2.1 Lining An inner lining is manufactured out of synthetic rubber like acrylonitrile-butadiene rubber (NBR), blends of NBR-Polyvinyl chloride (NBR-PVC) or chloroprene rubber (CR) compound resistant to liquefied petroleum gas. It shall be reasonably smooth in bore, uniform in thickness and free from air blisters, porosity and splits. 5.2.2 Reinforcement 5.2.2.1 For Type I hose the reinforcing wire or cord shall have surface treatment for good bonding with lining and cover compounds. 5.2.2.2 Type II shall have surface brass coated wire reinforcement applied in the form of braid between the lining and cover compounds. 5.2.3 Cover The cover shall be manufactured out of synthetic rubber compound resistant to abrasion, weather and liquefied petroleum gas. It may have cloth marked impression finish. The colour of cover for Type I shall be black and for Type II shall be orange. a)

IS 9573 : 2012 5.3 Dimensions and Tolerances 5.3.1 Bore Size The nominal bore size of the hose when measured according to method prescribed in 4.2.1.2 of IS 443 shall be as given in Table 1. 5.3.2 Thickness of Lining and Cover The thickness of the lining and cover of the hose, when measured according to the method prescribed in 4.2.2 of IS 443 shall be not less than 1.5 mm and 1.0 mm respectively for both Type I and Type II hoses. 5.3.3 Length The length of the hose shall be as agreed to between the purchaser and the supplier. Tolerance on any hose length shall be ±1 percent. When hoses are supplied with end connection, the length shall be the overall length including the end connections, subject to tolerance as agreed to between the purchaser and the manufacturer. 5.4 Requirement of Physical Properties of Lining and Cover Compounds 5.4.1 Tensile Strength and Elongation at Break of Lining and Cover Compound of Hose The tensile strength and elongation at break of the rubber compound used for lining and cover of the hose, when tested according to the method prescribed in 5 of IS 443 shall be as specified in Table 2. Tests shall be carried out on samples taken from sheet vulcanized to the same cured state as the production hoses. 5.4.2 Accelerated Ageing Test After ageing in air for 72 h at a temperature of 100 ± 1°C as prescribed in 6 of IS 443, tensile strength and elongation at break of lining and cover shall not decrease by more than 25 and 50 percent, respectively from the initial values.
NOTE -- There are no limitations on the increase in the values of these properties.

Table 1 Dimensions and Bend Radii for Rubber Hoses (Clauses 5.3.1 and 5.5.3)
Sl No. (1) i) ii) iii) iv) v) vi) vii) viii) ix) x) xi) xii) xiii) xiv) xv) xvi) xvii) xviii) xix) xx) Nominal Size mm (2) 6 8 10 12 15 16 19 22 25 29 32 35 38 46 50 51 60 63 75 76 Type I Bore Diameter mm (3) 6.5 8.3 10.7 13.2 15.5 16.4 19.2 22.7 25.5 29.1 31.7 35.4 38.5 46.6 50.6 50.6 60.9 63.6 75.6 75.6 Tolerance (4) ± 0.4 ± 0.4 ± 0.4 ± 0.5 ± 0.5 ± 0.5 ± 0.5 ± 0.5 ± 0.5 ± 0.5 ± 0.5 ± 0.5 ± 0.5 ± 0.6 ± 0.6 ± 0.6 ± 0.6 ± 0.6 ± 0.6 ± 0.6 Type II Bore Diameter mm (5) 8.3 10.8 13.2 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- Tolerance (6) ± 0.4 ± 0.5 ± 0.5 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- Outer Diameter Diameter mm (7) 14.9 17.3 22.7 24.0 25.9 28.7 35.2 38.0 41.6 44.2 48.9 52.0 60.0 65.4 64.4 78.3 81.0 93.0 93.0 Tolerance (8) ± 1.0 ± 1.0 ± 1.0 ± 1.0 ± 1.0 ± 1.0 ± 1.0 ± 1.0 ± 1.0 ± 1.0 ± 1.0 ± 1.0 ± 1.2 ± 1.2 ± 1.2 ± 1.2 ± 1.2 ± 1.2 ± 1.2 mm (9) 70 95 120 150 120 185 225 260 300 335 380 415 450 545 400 600 715 550 650 900 Minimum Bend Radii

Table 2 Tensile Strength and Elongation at Break for Lining and Cover (Clause 5.4.1)
Sl No. (1) i) ii)
1)

Property (2) Tensile strength, MPa1), Min Elongation at break, percent, Min

Lining (3) 10.0 200

Cover (4) 10.0 250

1 MPa = 10.2 kgf/cm2.

2

IS 9573 : 2012 5.4.3 Resistance of Lining to n-pentane 5.4.3.1 The n-pentane absorbed and the n-pentane extractable matter as determined by the method given in 5.4.3 2 shall not exceed 15 percent and 10 percent respectively of the initial mass of lining. 5.4.3.2 Immerse a weighed portion of the lining of the hose in liquid n-pentane at room temperature for 72 h (M0). The volume of n-pentane shall be at least 50 times the volume of the test piece. Following immersion reweigh the test piece after 5 min conditioning in air at room temperature (M1) and reweigh again after 24 h further conditioning under the same condition (M2). Calculate the percentage n-pentane absorbed and the n-pentane extractable matter as follows: a) Percentage n-pentane absorbed
= ( M1 ­ M2 ) × 100 M0

Measure the hose outside diameter with a caliper before bending the hose. Bend the hose to the minimum bend radius and measure the flatness with the caliper. 5.5.4 Ozone Resistance The length of hose test piece for conducting the test shall be calculated by the formula as: L = (rb + dext) + 2 dext where L = length of test piece; rb = bend radius of the hose as under test; and dext = outside diameter of the hose under test. Mount each test piece on a test piece holder as shown in Fig 1. The radius rb shall be equal to the specified minimum bend radius for the hose under test or, if not specified, the bend radius of hose shall be six times the inside diameter of the hose under test. Seal the ends of the test pieces with caps to prevent absorption of ozone by the inner lining and reinforcement. The hose test piece mounted on the holder as mentioned above, when exposed in an ozone cabinet to an ozone concentration of 50 ± 5 pphm at 40 ± 2°C for 72 ± 2h, shall show no sign of cracking when examined under 2X magnification, ignoring the area adjacent to the fixing points. 5.5.5 Hydraulic Test Requirement 5.5.5.1 Proof pressure test Each hose length or hose assembly complete with end connections when subjected to internal hydraulic pressure for 1 min, shall not show any rupture leakage or any other types of failure and the change in length shall be with in 12 percent of its original length when determined by the method prescribed in 8.3 of IS 443. The proof pressure shall be done at 5.0 MPa for Type I hose and at 2.0 MPa for Type II hose. 5.5.5.2 Bursting pressure Representative sample of hose having 60 cm length including test fittings, cut from a hose length approximately more than 100 cm long, when tested according to the method prescribed in 8.2 of IS 443 shall not burst below an internal hydraulic pressure of 10.0 MPa for Type I hose and 4.0 MPa for Type II hose. 5.5.6 Electrical Continuity Test The electrical continuity of wires in textile reinforced Type I hose after subjecting it to proof pressure test as per 5.5.5.1 shall be tested and maintained for each hose length from one end to another.

b) Percentage n-pentane extractable matter
( M0 ­ M2 ) × 100 = M0

where M0 = initial mass of sample; M1 = mass of sample after immersion and 5 min conditioning; and M2 = mass of sample after 24 h further conditioning. 5.5 Performance Requirements 5.5.1 Adhesion When tested in accordance with IS 3400 (Part 24), the minimum adhesion between rubber lining and reinforcement, between layers of reinforcement and between reinforcement and cover shall be not less than 1.5 kN/m for Type I, and 2 kN/m for Type II hoses.
NOTE -- 1kN/m = 2.50 kg/2.5 cm.

5.5.2 Low Temperature Flexibility When a test piece cut from a length of hose is conditioned at ­ 40 ± 2°C for 5 h and then bent at 180º around a mandrel with a diameter 12 times the nominal bore diameter of the hose, no cracks or breaks shall be shown. 5.5.3 Flexibility of Hose When bent to the minimum bend radius given in Table 1. Measured on the inside of the bend, the flatness shall not exceed 10 percent of the original outside diameter.

3

IS 9573 : 2012 5.5.7 Grip Strength Test The Type II hoses when tested in accordance with test method given in Annex A, the hose shall comply with the requirements given below: The hose shall fit over the standard and over size metal nozzle shown in Fig. 2. b) It shall remain attached to both nozzles throughout the test period. 5.5.8 Burning Behaviour 5.5.8.1 When tested by the method given in 5.5.8.2 the hose shall not burn to either of the outer marks within 45 s. 5.5.8.2 Support horizontally a length of Type II hose of minimum length 150 mm as shown in Fig. 3. Make three marks on the sample, the middle one approximately midway along the sample and the other two on either side, 50 mm from the middle mark. Direct a well aerated Bunsen flame (approximately 1 800 kJ/h and about 25 mm in diameter) on the sample so that the flame is horizontal, in the plane of the sample and perpendicular to the axis of the sample, the central mark being in the middle of the flame. Apply the flame for 5 s and then remove it for 1 s. Repeat the application of the flame until the material catches fire and continues to burn or until a total test period of 45 s has elapsed. a) If the material catches fire and continues to burn without further application of the flame, note whether the flame catches either of the outer marks within 45 s of the commencement of the test. 6 PACKING AND MARKING 6.1 Packing The hose shall be packed as agreed to between the purchaser and the supplier. 6.2 Marking Each length of the hose shall be clearly and durably marked at intervals of not more than 0.5 m with the following information: a) Manufacturer's name or trade-mark, if any; b) Words LPG Max W.P. 2.5 MPa for Type I, and LPG Max W.P. 1.0 MPa for Type II; c) Nominal bore; d) Batch/Lot No.; e) Month and year of manufacture; and f) Type of hose. 6.2.1 BIS Certification Marking Each length of the hose may also be marked with the Standard Mark.

ALUMINIUM PLUG

ALUMINIUM BASE PLATE F IG. 1 ARRANGEMENT FOR MOUNTING HOSE 4

IS 9573 : 2012

2A Nozzle for 7.90 mm Bore Type II Hose

2B Nozzle for 7.90 mm Bore Tubing (Alternate)
All dimensions in millimetres. NOTE -- Tolerance on all dimensions: ± 0.25 mm.

FIG. 2 STANDARD METAL NOZZLE FOR 7.9 mm B ORE TYPE II HOSE

All dimensions in millimetres.

F IG. 3 TEST FOR BURNING B EHAVIOUR 5

IS 9573 : 2012 6.2.1.1 The use of the Standard Mark is governed by the provisions of the Bureau of Indian Standards Act, 1986 and the Rules and Regulations made thereunder. The details of conditions under which the licence for the use of the Standard Mark may be granted to manufacturers or producers may be obtained from the Bureau of Indian Standards. 7 SAMPLING CONFORMITY AND CRITERIA FOR sampling and the criteria for conformity shall be as prescribed in 3 of IS 443. 8 TIME LAPSE BETWEEN RECEIPT OF MATERIAL AND TESTING 8.1 For the test purposes, the minimum time between vulcanization and testing shall be 16 h. 8.1.1 For product tests, whenever possible, the time between vulcanization and testing should not exceed 4 months. In other cases, tests shall be made within 2 months from the date of receipt of the product by the customer.

For the purpose of ascertaining the conformity of the hose in a consignment to the specification, the scale of

ANNEX A (Clause 5.5.7 )
GRIP STRENGTH TEST A-1 PROCEDURE A-1.1 Four specimens of hose, each 150 mm long and clean of lubricant shall be tested. A-1.2 Force each test piece over a standard nozzle (see Fig. 2) at one end and on oversize nozzle at the other (see Fig. 4). The oversize nozzle shall consist of cylindrical piece of metal of diameter corresponding to that shown in Fig. 4. Attach each standard nozzle to a hook and suspend the test pieces so that the axis of the tubing and nozzles are in the same vertical straight line. Attach a mass of 4.5 kg to the lower (oversize) nozzle and leave the assembly for 30 min. Reject a test piece, if it slips off either nozzle during this period. A-1.3 Place the test assembly without mass not rejected, in an ageing oven and leave them for 72 h at 100°C. Then examine the test pieces for signs of splitting or cracks. A-1.4 Cool to room temperature and then test the assemblies for leaks at 0.70 Mpa air pressure under water for 5 min. There should not be air leakage.

NOTES 1 For Type II, 8.0 mm bore hose, A = 10.00 mm. 2 Tolerance on all dimensions: ±0.125 mm. All dimensions in millimetres.

F IG. 4 OVERSIZE METAL NOZZLE

6

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Amendments Issued Since Publication Amend No. Date of Issue Text Affected

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